Zobrazeno 1 - 10
of 41
pro vyhledávání: '"Ushijima, Ichiro"'
Autor:
Clock, International, Networking, Oscillator, Collaboration, Amy-Klein, Anne, Benkler, Erik, Blondé, Pascal, Bongs, Kai, Cantin, Etienne, Chardonnet, Christian, Denker, Heiner, Dörscher, Sören, Feng, Chen-Hao, Gaudron, Jacques-Olivier, Gill, Patrick, Hill, Ian R, Huang, Wei, Johnson, Matthew Y H, Kale, Yogeshwar B, Katori, Hidetoshi, Klose, Joshua, Kronjäger, Jochen, Kuhl, Alexander, Targat, Rodolphe Le, Lisdat, Christian, Lopez, Olivier, Lücke, Tim, Mazouth, Maxime, Mukherjee, Shambo, Nosske, Ingo, Pointard, Benjamin, Pottie, Paul-Eric, Schioppo, Marco, Singh, Yeshpal, Stahl, Kilian, Takamoto, Masao, Tønnes, Mads, Tunesi, Jacob, Ushijima, Ichiro, Vishwakarma, Chetan
Optical clocks have improved their frequency stability and estimated accuracy by more than two orders of magnitude over the best caesium microwave clocks that realise the SI second. Accordingly, an optical redefinition of the second has been widely d
Externí odkaz:
http://arxiv.org/abs/2410.22973
Publikováno v:
Phys. Rev. Lett. 121, 263202 (2018)
We experimentally investigate the lattice-induced light shift by the electric-quadrupole ($E2$) and magnetic-dipole ($M1$) polarizabilities and the hyperpolarizability in Sr optical lattice clocks. Precise control of the axial as well as the radial m
Externí odkaz:
http://arxiv.org/abs/1812.11815
Autor:
Takano, Tetsushi, Takamoto, Masao, Ushijima, Ichiro, Ohmae, Noriaki, Akatsuka, Tomoya, Yamaguchi, Atsushi, Kuroishi, Yuki, Munekane, Hiroshi, Miyahara, Basara, Katori, Hidetoshi
According to the Einstein's theory of relativity, the passage of time changes in a gravitational field. On earth, raising a clock by one centimetre increases its tick rate by 1.1 parts in 10$^{18}$, enabling optical clocks to perform precision geodes
Externí odkaz:
http://arxiv.org/abs/1608.07650
Autor:
Nemitz, Nils, Ohkubo, Takuya, Takamoto, Masao, Ushijima, Ichiro, Das, Manoj, Ohmae, Noriaki, Katori, Hidetoshi
Transition frequencies of atoms and ions are among the most accurately accessible quantities in nature, playing important roles in pushing the frontiers of science by testing fundamental laws of physics, in addition to a wide range of applications su
Externí odkaz:
http://arxiv.org/abs/1601.04582
Autor:
Takamoto, Masao, Ushijima, Ichiro, Das, Manoj, Nemitz, Nils, Ohkubo, Takuya, Yamanaka, Kazuhiro, Ohmae, Noriaki, Takano, Tetsushi, Akatsuka, Tomoya, Yamaguchi, Atsushi, Katori, Hidetoshi
This article describes the recent progress of optical lattice clocks with neutral strontium ($^{87}$Sr), ytterbium ($^{171}$Yb) and mercury ($^{199}$Hg) atoms. In particular, we present frequency comparison between the clocks locally via an optical f
Externí odkaz:
http://arxiv.org/abs/1505.03207
We report on a frequency ratio measurement of a ${}^{199}$Hg-based optical lattice clock referencing a ${}^{87}$Sr-based clock. Evaluations of lattice light shift, including atomic-motion-dependent shift, enable us to achieve a total systematic uncer
Externí odkaz:
http://arxiv.org/abs/1503.07941
Time and frequency are the most accurately measurable quantities, providing foundations for science and modern technologies. The accuracy relies on the SI (Syst\'eme International) second that refers to Cs microwave clocks with fractional uncertainti
Externí odkaz:
http://arxiv.org/abs/1405.4071
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